<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
	body{
		margin:0 ;
	}
		.red,.green,.blue{
			width: 200px;
			height: 200px;
		}
		.red{
			background: red;
			float:left;
		}
		.green{
			background: green;
			float:left;
		}
		.blue{
			background: blue;
			float:right;

		}
		span{
			float: left;
			background: pink;
			width:100px;
			height: 200px;
		}
	</style>
</head>
<body>
	<div class="red"></div>
	<div class="green"></div>
	<div class="blue"></div>
	<span></span>
</body>
</html>